DP Chemistry (last assessment 2024)
Question 20N.2.sl.TZ0.d(iii)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.2.sl.TZ0.d(iii) |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | Describe | Question number | d(iii) | Adapted from | N/A |
d(iii).
[Maximum mark: 2]
20N.2.sl.TZ0.d(iii)
Nickel catalyses the conversion of propanone to propan-2-ol.
Describe the bonding in metals.
[2]
Markscheme
electrostatic attraction ✔
between «a lattice of» metal/positive ions/cations AND «a sea of» delocalized electrons ✔
Accept “mobile/free electrons”.
Examiners report
The mean mark on the question was 1.0 out of 2 marks. Mistakes included not mentioning the 'electrostatic attraction' and talking about 'nuclei attracting the delocalised electrons'. The weakest candidates discussed aspects of ionic and/or covalent bonding.
